Automatic hammering machine for use in the manufacture of shoes



J. ZAORAL AUTOMATIC HAMMERING MACHINE FOR USE IN Nov. 29, 1949 THE MANUFACTURE OF SHOES Filed Nov. 5, 1946 2 Sheefs-Sheet 1 I 1 IIIIIIIIIIII/ IN V EN TOR.-

fazuau,

Nov. 29, 1949 J. ZAORAL 2,489,554

AUTOMATIC HAMMERING MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Nov. 5, 1946 2 Sheets-Sheet 2 Patented Nov. 29,, 1949 AUTOMATIC. HAMMERING MACIHNJE. FOR: USE IN THE MANUFACTURE. OF SHOES Josef Z'aoral, Zlin; Czechoslovakia, assign'br' to- Bata; Narodni podnik, Zl-i-n, Gz'eehoslovakia ApplicationN ovember 5, 194.6,-S erial l\l 0.707.,815

Germany October 4,1940

Section 1,:Publi'e Law 690;=Aug"ust8,- I946' Patent expires ctohen4,. 19.6.0

6- Claims: (01. 12:51")

This invention. relates to. ounding-up or'han'imerin'g machines used in the manufacture of' shoes. I

Automatic pounding-up or hammering machines are not used to a larger, extent in shoe manufacture, although manual hammering is a very tiresome and exhausting operation" in view of the. large numberof shocks which are transmitted'to' the operators" body, because the auto matic pounding-up machines of known construetion show a number of disadvantages and have not entirely replaced the hand operation in which a skilled assistant treats each Work piece according to any variations which may appear in' the material and" to the preceding treatment to which. the work, that is the lasted upper, has been subjected. The main draw back of the known mach nes consists in this, that in portions where the leather is thicker and/or in the case of faulty clamping of the last, the. hammering of the uppers may result. either in perforation of the leather at the border or, alternativel'y, in insvficient hammering, so that the' operator then has to complete the hammering operation by hand. The clamping device has to be adjusted even for small" variations in the size of the uppers to be treated, which-circumstance leads to complications in the clampingdevice it'- self and in the machine as awhole'and thus to' expensive construction of the machine" and to" backs of all known machines ofthekindreferred' to and securesgood results of manufacture even in the case. of considerable variations and/or irregularities in the upper material.

li'he essential features of the invention consists in that with a fixedly mounted hammering drum and with automatic feed of thework carrying last into operating position, the feeding device for the last is arranged resiliently and yieldably in such a mannerthat the same is automatically brought to. hammering position of theworlg carrying last in the. two main directions of operative movement; thatisin a dlre'c' son at right anglestothe surface or the" drum audit: Motion is transmitted. from the campath s" and. ina. direction toward the hammer. The, last clamped in a holdeif receives. an initial and a final impulse for its operative movement by means. of a lihlii'meehani'sih from suitable cams orf the". like, but. the appropriate" adjustment of the work under the drum and" toward the harnnier is performed by the" yieldable device just mentioned which a'dap'ts to the shape of the'l'ast thefeeclihgmovement.of'the work into its operating position. In this way accuiacy'in operation and; safety of the hammering operation are" secured, and thus it i's'poss'ible to pound up shoesv of any practical size" without adjustment of the machine. 7

Other objects andadvantages. of the invention are disclosed in the following description with reference to the appendant. drawings which.

show schematically and by way' of example" an automatic. p'ciun'di'ng up machine constructed in Fig. 4" is. a View on a larger scale showing the construction of the hammering device.

Adriving shaft I has secur'edithereonja number of discs provided with cam" paths 2', 3; 4; 5

by, means of" suitable 'link'mecha'nisms to anop'erating' column 1 on which a' holder 8. for' the last 9 isadfi'u'stably" mounted; The shaft. I isniounted in the machine frame wo'rkf lffiand isdriven" by amotor (not shown) which" is controlled by the footlever S5; Thehannnering'drum ll ismount "5,. via. a movement. up and dawn; a movement. forward and rearwarda rotary movement around. its" proper axis and a. swinging] movement froni left to right and vice versa.

The. up, and? down movement of the. operating column 5. is derived'from the cam path Zby means. of a roller l'i'anda' dbubl'e-ari'nedlever' 16 providedion-one endwith aifork l3? and on the other end" with. a; hinge? 5.9" for; c cm'riect'ingv a spring 20, the lever. It being rotatable a r'ouhdfa pivot pin 2]. Thet'en'sioii'of the springniaybe regulated cam path 3 to the operating column I (Fig. 3). L:

Motion is transmitted by means of a roller from the cam path 3 to a link SI which is mounted in a guide 32 on the frame II] and carries on its opposite end a rack 33. The rack 33 engages with a toothed sector 35 mounted rotatably on a pivot pin 35. To the sector 35 there is secured a second toothed sector 36 which also is rotatable around the pivot pin 35 and has its teeth in engagement with those of a spur wheel 29, whereby the column I is caused to rotate.

The forward and rearward movement of the operating column is transmitted from the cam path 4 by means of a roller 3? to a double-armed lever 38 which is rotatable on a shaft 35 (Fig. 2) and has its opposite end connected by means of an universal joint 55 with a link i- I. The link 4! passes freely through a spherical bearing 42 and at 53 is articulated to the casing 27 by means of which the motion of link M is transmitted to the operating column I. 42 is located in a frame 44 which is slidable in a recess provided in the head 55. The head 45 forms the one end of the double-armed lever 46 rotatable around a pivot pin 5! and to which swinging motion is imparted from the cam path 5 through a roller it on a link 53 which is rotatable on the shaft 39. The link 39 is connected by means of a rod with a lever 55 rotatable on a pivot pin 52 and which by means of an adjustable pin 53 is connected to the other end of lever 46.

The head 35 and with the same the link ll and column I have imparted thereto swinging movement from left to right and in the opposite direction, the extent of such movement being adjustable by means of the shiftable pin 53 in accordance with the operations to be performed. By means of a hinge 54 the link iI is connected with a spring 55, the tension of which may be varied by a screw 56.

The hammer I5 (Fig. 4) is provided with a heating element 51 (e. g. an electric or steam heated element) and is rotatable around a pivot pin 58 on an arm 59 which is mounted rotatably on a shaft 55. The arm 59 is caused to turn by a link BI from the cam path 6 over a roller 62 and a lever 63 (Fig. 1) which is rotatable on the shaft 35. Operating motion is imparted to the hammer I5 in a manner known per se from a cam not shown which is mounted on the shaft and is rotated in unison with the hammering drum H by means of an arm 64 (Fig. 4). The hammer I5 and arm 54 are spring loaded as shown at 66.

The machine operates as follows:

When the machine is inoperative the cams 2 and 4 keep the column I ineffective in a position towards the working station of the operator. As soon as the work carrying last 9 has been clamped in the holder 8 the operator depresses the foot lever 55 whereby the machine is started, so that the hammering drum I I begins to revolve and also rotary motion is imparted to the driving cam shaft I. The cam paths 2 and 4 for the two main movements, up and down, forward and rearward, are open and the rollers I! The spherical bearing and 31 of the respective levers I6 and 38 are forced thereagainst by means of springs 20 and 55. The tension of the springs 20 and 55 is active in the sense of forcing the operating column toward the hammering drum II and hammer I5. When the machine is out of operation, the cams 2 and i by means of their fingers neutralize the tension of the springs 20 and 55, whereby the column i is kept in a position remote from the hammering drum and hammer. Upon rotation of the shaft i and of the cams 2 and 4 the rollers I"! and 3? of the lever device leave the cam and this lever device is now entirely under the infiuence of the tension of springs '20 and 55, so that the column I carrying the last 9 is forced against the drum II and hammer I5.

As soon as the work carrying last 9 engages on the hammering drum and hammer, the pounding-up operation proper begins. By the effect of the cam paths 3 and 5 and of the corresponding link device, as above described, the operating column is caused to turn and swing to the required extent together with the Work piece. Irrespectively of the position of column 7, the Work w. piece always sits and is hammered uniformly, the

hammering action being constantly adapted by the tension of the springs 25 and 55 to the particular shape of the last, the thickness of the leather and to any other disturbing factor. In certain positions of the operating colum 'i-as required for correct hammering-the hammer I5 is caused to swing out of its original position by the cam path 6 and link mechanism 62, 63, BI and 59, and this movement is followed by a corresponding movement of the last under the action of the tension springs '25 and 55, thereby changing the position Where the hammering drum I I operates. Through the rocking of the arm 59 on shaft 60, the hammer i5 is advanced or retracted with relation to the Work piece, which latter at the same time is yieldingly urged into contact with the hammer by the spring 55. This bodily motion of the hammer mount toward or from the workpiece and resultant movement of the workpiece thus varies the effective intensity of the hammer blows on the workpiece even though the force of the hammer blows remains constant. In this way the hammering action is varied in intensity corresponding to the demand for correct hammering of the respective portions of the shoe which variation is of utmost importance when the toe portion of the shoe is being hammered.

From the foregoing description it clearly appears that under all conditions the engagement and therefore also the hammering action is adapted to the shape of the last, so that on the same machine it is possible to pound up left as well as right shoes and also various kinds and sizes of shoes without any construction changes in the machine. The adjustable tension of the springs 25 and 55 may be easily adapted to the quality and kind of leather.

If necessary, e. g. in the case of accident or the like, the operating column I may be moved by the assistant out of its working position during operation of the machine as the muscular force of the assistant is sufficient to overcome the spring tension.

The heated hammer in addition to its hammering action proper irons the work piece and in this way further improves the quality of the product.

It should be understood that the example shown and described of the automatic hammering machine has not any limiting character, as in the various details of the same numerous changes may be made, without affecting the spirit of the invention as defined in the appendant claims.

What I claim is:

1. In an automatic hammering machine for use in the manufacture of shoes including a fixedly mounted hammering drum and a side beating hammer adjacent thereto, means for supporting a work piece to be operated upon by said hammering drum and hammer and for automatically feeding the same into various operating positions including spring means associated with said support and automatic feeding means for yieldingly engaging the work piece with said hammering drum and hammer during the movements through the Various operating positiolns.

2. In an automatic hammering machine for use in the manufacture of shoes including a fixedly mounted hammering drum, means for supporting a work piece to be operated upon by said hammering drum and for automatically feeding the same into various operating positions comprising an upstanding casing mounted for universal movement, a column member journalled in said casing, a work support mounted on said column, means for moving said casing in various directions and for imparting rotary motion to said column and resilient means for yieldingly engaging the work piece with the hammering drum during the movement of said casing and column.

3. In an automatic hammering machine for use in the manufacture of shoes with a fixedly mounted hammering drum and automatic feeding of the work piece into operating position, an operating column enclosed within a casing, said casing being mounted for universal motion and having operating movements imparted thereto, a shaft connected by a universal joint with the column, a link mechanism associated with a cam path and an adjustable tension spring and imparting up and down movement to said column and a toothed wheel associated with toothed sectors, a rack and a cam path and imparting rotary movement to the column, the said two movements of the column being independent of the operating movements of the casing.

4. In an automatic hammering machine for use in the manufacture of shoes with a fixedly mounted hammering drum and automatic feeding of the work piece into operating position, an operating column enclosed within a casing, said casing being mounted for universal motion and having operating movements imparted thereto,

and a double-armed lever connected by means of an adjustable pivot pin with a further lever so as to vary the extent of the lateral movement of said casing.

5. In an automatic hammering machine for use in the manufacture of shoes including a fixedly mounted hammering drum, an oscillating hammer adjacent thereto and means for automatic feeding of the work piece into operating position, the provision of spring means associated with the device for feeding the work piece to operating position in such a manner as to move the work piece in the two main directions of operative motion, one of which is at right angles to the surface of the hammering drum and the other toward the hammer, thereby to bring the last into hammering position, and means for automatically shifting the operating position of said hammer in timed relation to the feeding of the work piece during the hammering operation.

6. In an automatic hammering machine for use in the manufacture of shoes including a fixedly mounted hammering drum, an oscillating hammer adjacent thereto and means for automatic feeding of the work piece into operating position, the provision of spring means associated with the device for feeding the work piece to operating position in such a manner as to move the work piece in the two main directions of operative motion, one of which is at right angles to the surface of the hammering drum and the other toward the hammer, thereby to bring the last into hammering position, a rotatable arm on which the hammer is mounted, a shaft carrying said rotatable arm and a link mechanism associated with a cam path and adapted to rotate the said arm.

JOSEF ZAORAL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,285,740 Knowlton Nov. 26, 1918 1,847,547 Zweifel et a1. Mar. 1, 1932 2,222,774 Knowlton Nov. 26, 1940 FOREIGN PATENTS Number Country Date 529,686 Germany July 16, 1931 533,099 Germany Sept. 12, 1931 

